Franz f



(No Model.)

P.F.BOEGNBR.

ALARM.

No. 478.982. Patented Jul 19, 1892.

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UNITED STATES ATENT GFFIGE.

FRANZ F. BOEGNER, OF NEW YORK, N. Y.

ALARM.

SPECIFICATION forming part of Letters Patent No. 478,982, dated July 19,1892.

Application filed April 1,1892- Serial No. 427,326. (No model.)

To ail whom it may concern:

Be it known that I, FRANZ F. BOEGNER, of New York city, New York, haveinvented an Improved Alarm, of which the following is a specification.

This invention relates to an alarm adapted to engage the spindle of adoor-latch and to be sounded by the turning of the door-knob.

It consists in the various features of improvement more fully pointedout in the claim.

In the accompanying drawings, Figure 1 is an elevation of my improvedalarm; Fig. 2, an end view thereof; and Fig. 3, a cross-section on linea: 00, Fig. 1.

The letters a a represent two converging levers turning on pivots a of apair of crossarms I) and terminating on top in a pair of semicircularjaws a These jaws are held against the spindle o of the door-latch by acurved spring 01, that bears with its ends against the free ends of thelevers a. The spring (1 is coiled around a pin 19, passing through thecenter of arms (7. From this pin there is suspended by a forked stem f abell f, having the usual hammer f. The jaws a may be provided with asuitable cushion or packing 6. Normally the bell hangs in linevertically below the spindle 0; but when the spindle is revolved byeither one of its knobs c the levers a, which are tightly held thereto,will assume an inclined position. This will cause the hammer f to bethrown against the bell, so as to sound the same.

lVhat I claim is The combination of a pair of converging levers a,having concave jaws M, with the connecting-arm b, to which the leversare pivoted, a spring d for forcing the jaws a together, and a bell f,suspended from the connectingarm, substantially as specified.

FRANZ F. BOEGNER.

Witnesses:

F. v. BRIESEN, A. J ONGHMANS.

